退火对微注射成型HDPE制品的增强增韧作用  

Effect of Annealing on Strengthening and Toughening of HDPE Parts by Micro Injection Molding

作　　者：石素宇[1] 王利娜[1] 赵康[2] 袁康帅 杨秀琴[1] Shi Suyu Wang Lina Zhao Kang Yuan Kangshuai Yang Xiuqin(School of Materials and Chemical Engineering, Henan Institute of Engineering, Zhengzhou,Henan, 450007 School of Material Science and Engineering, Zhengzhou University, Zhengzhou, Henan,450001)

机构地区：[1]河南工程学院材料与化学工程学院,河南郑州450007 [2]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《现代塑料加工应用》2017年第1期6-8,共3页Modern Plastics Processing and Applications

基　　金：国家自然科学基金(51173171)资助;河南工程学院博士基金项目(D2015018)

摘　　要：分别在3个不同温度(85,105,125℃)进行退火3h,考察了退火前后高密度聚乙烯(HDPE)制品微结构和力学性能的变化。拉伸测试结果表明,退火显著提高了制品的拉伸强度和断裂韧性。利用差示扫描量热仪和X-射线衍射仪对退火后制品微结构的变化进行表征。结果表明,退火诱导新晶体的形成,促进初级晶体的完善、增厚,制品的结晶度提高。通过分析微结构的变化,阐明了微注射成型HDPE制品的增强增韧机理。HDPE parts were prepared by micro-injection molding and then annealed at three different temperatures （85,105, 125 ℃） for 3 h, respectively. Mechanical proper- ties and microstructure of HDPE parts before and after being annealed were investigated. Tensile test indicates that tensile strength and toughness are enhanced significantly after being annealed. Differential scanning calorimetry （DSC） and X-ray diffraction （XRD） were performed to characterize the microstructure variations of annealed parts. The results show that annealing induces the development of new crystals,and promotes perfection and thickening of primary lamellae, and crystallinity of parts increases. Based on analysis of microstructure variations, mechanism for enhancement of strength and toughness of mi- cro injection molded HDPE parts is proposed.

关 键 词：退火 微注射成型 高密度聚乙烯 增强 增韧 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]